Worm gear unit for venetian blinds or the like



FIG. 1 is a front, top and right side perspective view of a worm gear unit for venetian blinds or the like showing my new design;

FIG. 2 is a rear, bottom and right side perspective view;

FIG. 3 is a right side elevated view;

FIG. 4 is a top plan view;

FIG. 5 is a bottom plan view;

FIG. 6 is a front elevational view; and

FIG. 7 is a rear elevational view. 

The ornamental design for a worm gear unit for venetian blinds or the like, as shown. 